Personal conjecture based on rational reading of historical texts, true. I also didn’t try to apply modern standards of conscience and morality into my opinion.
I suggest that you do some research on the Roman Army who were used for these executions and find out for yourself as to how they operated. As far as the condemned carrying the crossbeam to the upright pole that is a very well known and historically documented fact. The crossbeam was attached, the condemned attached to it and then the whole device slipped into a prepared hole. There were of course other methods which included stringing someone up on a single board, impaling them in different ways or even making use of a tree.
As to your assertion someone wouldn’t flail about in an attempt to escape such a fate is really laughable. Ever seen people desperately trying to escape fire or an accident or being trapped in some way? I have, a lot more than once. I would bet that more than a few struggled, if from nothing more than sheer panic, until they passed out and then probably expired. I doubt that very many hung there limp and resigned to their fate. That doesn’t sound much like human nature. Also lets remember not all were nailed to the cross, many were bound while others were nailed and still others nailed and bound. Those bound could expect to last for a good while as they hung there while those nailed usually went pretty quickly.
You are quite right in stating that Centurians wouldn’t be doing the crucfixtions.

Centurians were Officers in charge of a centuria, probably equivalent to a Captain these days. The men doing the dirty work would probably have been a few specialists, optios perhaps, who knew the procedures for the different types of executions, and miles, roughly equivalent to privates these days and whose name means herd animal These would probably have been supplanted by men on restriction for disciplinary reasons or those on duty. There is also evidence that slaves would be pressed into service for this task on occasion.
As to it being a gruesome job, yes it was, but the Roman soldiers didn’t adhere to modern norms of conduct and sensibilities. They lived a brutal existance in a brutal world. They existed in a world where slight infractions could result in a sentence of death, where floggings were common and conducted in full view of everyone and discipline was maintained in a fashion unthinkable to modern sensibilities. A not uncommon unit punishment was to stone to death or beat to death every tenth man in the unit, with the unit members carrying out the executions. That punishment was usually reserved for desertions, muitny or failure to adequitely carry out unit orders.
In the end result. no I don’t know exactly how they were done in each and every case, and neither, my friend, do you:thumbsup: But based on the historical knowledge we have of the Roman Army and how they operated I think my argument make a lot of sense.
But hey, I’m just an old conservative. What could I possibly know about anything at all?